We had a heater refuse to run last night and the temp was 39 degrees when I showed up this morning. Is there anything that I should worry about/look for? So far they seem fine.

Thanks in advance,
Ernie

Ernie, I do not think that one night at 39F has done any damage as long as they were in doors. Outside at 39F with a mild breeze might be another story.....Michael Pawelek

Thanks Michael! Having never been through this before, it's nice to have some experienced growers to fall back on. The heater didn't run last night either but it was warmer outside. Only got down to 49 degrees. If this keeps up, they'll be hardy to Zone 5. Or maybe not...........but it's fun to speculate anyway Anybody doing any pot in pot poinsettias?

Regards,
Ernie

I had a vent stick open once a few years ago and the temperatures were at least that cold. I ended up losing a few close to the area of the vent, but the rest came back. Quite a few were showing a wilted look in the morning and then by that afternoon they came back to normal. I went through and watered them to bring the soil temperatures back up to at least the temperature of the well water(45-50 degrees). Hope everything turns out well for you.

Points can suffer chilling injury without actual plant death when they are exposed to temps from 32-50F. Of course the longer the plants are exposed the worse the damage could be. Damage may not show up right away but show up after time as the plants begin to warm up. On red bracts you may see something that looks similar to botrytis with a bluish cast. On pink or white bracts the tissue by turn brown. The plant may wilt initially but than recover. If you do find damaged tissue a fungicide spray for botrtyis would be a good idea as the damaged tissue is a good place for botrytis to set in. You can remove the damaged bracts than spray the rest of the plants to prevent spread of any botytis infection.

Chances are if you don't see any damage by now you should be in the clear